Drill.



JOHN .AUER, OF PORTLAND, OREGON.

DRILL.

To all whom it may concern:

1 Be it known that I, JOHN AUER, a citizen of the United States, 'residing at Portland, in the county of Multnomah, State of Oregon', have invented anew and useful Drill, of which the following is a specification.

This invention .relates to improvements in hand drills and has for its primary object to provide a hand drill of simple and inexpensive construction. which may be easily and readily converted into a breast or brace drill as desired.

An object of the invention is to generally improve and simplify the construction. and operation of hand drills so as to increase their usefulness without materially adding to-the cost of manufacture thereof.

This invention consists primarily in a hand drill so constructed that it may he operated either as a breast or brace drill as desired and is provided with a two-part shaft having a telescopic union, each portion of the shaft carrying a gear keyed thereon, a thrust bearing situated between the two shafts, a gear wheel having two sets of teeth adaptedto engage the above mentioned gears so as to rotate the lower portion of the two-part shaft at a greater speed than the upper portion.

In the drawings:

Figure-1 is a side elevation of my im proved hand drill showing it as it appears when ready for use as a breast drill.

Fig. 2 is'a side elevation of the drill as shown in Fig. 1 taken at right angles to Fig. 1.

Fig. 3 is a detail elevation of the drill spindle showing'it broken away and in section. i

Fig. 1 is a cross sectional view taken on line 4.al, Fig. 2; and

Fig. 5 is a'front elevation of the drill showing it as it would appear when used as a brace drill and a brace in dotted lines.

Referring to thedrawings, 1 designates a drill frame in which is rotatably mounted a drill spindle 2 carrying a chuck 3 on its lower end for the retention of a drill or other tool. A-bevel pinion 4 is keyed to the spindle 2 by the pin 2 and meshes with a bevel-gear 5 which is mounted upon a stud Specification of Letters Patent. Patefitd Aug, 13, 1918, Application filed August 29, 1917. Serial No. 188,859.

I 6 carried by and projecting outwardly'from I the frame 1. This gear 5 is provided with two annular rows of teeth 7 v and 8 respectively. The outer row 7 meshes with the bevel gear 5 and the inner row 8 meshes with a bevel gear 9 which is keyed to an operating shaft 10 by the pin 10. The upper end of the shaft 10 is squared asat 11 so that it may be inserted within the chuck of a carpenters brace, as shown at 12 in Fig. 5 of the drawings.

The spindle 2 is held against movement away from the shaft 10 by reason of the gear 4 thrusting against the bearing for the spindle, and the shaft 10 is held against movement away from thespindle 2 by reason of'the gear 9 thrusting against the bearing for the shaft 10. a i i The spindle 2 and the shaft 10 provide a two piece shaft for the purpose of transmitting power from the operator to the drill bit. The shaft 10 is reduced at itslower end to form the male member 13 that is received within a socket or female member 14 formedin the spindle 2, thus providing a part-way telescoping of the two piece shaft. Ball bearing members 15 consisting of the usual cup, balls and cone are mounted between the two gears 4 and 9 around the male member 13, thus formmg a roller thrust bearing. A crank handle 16 is attached to the bevel gear 5 and provides for the rotation of said gear. The frame is provided with handle sockets 17 in which a handle 18 may be in sorted to act as a holding means for the drill during the operation thereof.

The foregoing description relates to the form of drill which is commonly used in connection with the ordinary carpenters brace of the type shown in dotted'lines in Fig. .5 of the drawings. In this type of drill it will be seen that the operating shaft 10 1 extends above the frame 1 and prevents the use of'the drill as a breast drill.

I have provided ameans for using the drill such as hereinbefore described as a breast drill, this means being so mounted upon thedrill frame that it may be moved into and out of position as desired and there-' fore permits the use of the drill either as a breast or brace drill. This means comprises a slidable frame generally designated 19 which consists of slide bars 20 that are mounted for sliding movement within ears 21 formed on the frame 1. The bars 20 are provided with notches 22 in which spring pressed detents 23 carried in the frame 1 are adapted to engage to lock the frame in extended position. On their outer ends the bars 20 carry a breast-engaging member in the form of a ring 24. These bars are preferably screw-threaded as at 25 and turn into the ring 24. A stop lug 26 is carried by one of the bars 20 and is adapted to engage the lower end of one of the ears 21 to prevent the bars from being pulled out of the ears.

As shown in Figs. 1 and 2 of the drawings, the drill is ready for use as a breast drill, the frame 19 having been extended to bring the breast member 2% outwardly beyond the squared end 11 of the shaft 10.

4. The handle 18 may be grasped to steady the drill during the operation thereof.

It is to be noted that when the drill is operated as a breast drill the shaft 10 rotates idly, motion being transmitted thereto 30 through the inner row of gear teeth 8 and bevel gear 9 which is keyed to the shaft 10.

To use the drill in connection with a carpenters brace the locking means or spring pressed detents 23 are moved out of the notches 22 in the bars 20 and the frame 19 is moved-inwardly into closed position as shown in Fig. 5 of the drawings. When the frame is thus moved into closed position the breast member 24 is located in engagement with the end of the frame 1, and the upper squared end 11 of the shaft 10 is free to be connected with a brace, as shown at 12, in Fig. 5. Then the brace is operated the shaft 10 is rotated and transmits rotation through the pinion 9, bevel gear 5 and pinion 4: to spindle 2. l/Vhen the device is in this position the frame 19 may be easily extended into position shown in Figs. 1

and 2 of the drawings to adapt it for use as I a breast drill.

Referring to thedrawings, it will be seen that this invention provides for a relatively faster rotation of the spindle 2 than of the shaft 1.0 by providing the large gear5 with two rows of teeth 7 and 8. This advantage of change of speed is acquired whether the drill is operated by the brace or in the breast position. When the drill is operated by the handle 16, 'meshingof the large gear 7 with the relatively smaller gear 1 causes a much faster rotation of the spindle 2 than of the handle 16. l/Vhen operated by a bit stock or brace through the shaft 10 the same result is obtained through the meshing of the relatively equal gears 8 and 9 which drive the large gear 5 and then through the teeth 7 and pinion 4 the spindle 2 is caused to rotate much more rapidly than the shaft 10.

An important feature of this invention is that by a part way telescoping of the two shafts by use of the male and female pinions 13 and 14, the two shafts are given greater rigidity and more journal bearing.

It will be seen with reference to the foregoing description and accompanying drawings that I have provided a combined brace and breast drill which may be operated for either purpose at will without requiring any change of construction of the drill, and while I have illustrated and described the preferred embodiment of the drill it is to be understood that various minor changes in details of construction may be resorted to when required without departing from the spirit or scope of the invention as defined in the appended claims.

I claim:

1. A hand drill comprising a frame, an operating shaft ournaled in the frame having its upper end extending beyond the frame and squared for cooperation with a brace, and a breast member slidable upon the frame and adapted to be extended beyond the squared end of the operating shaft to permit the use of the frame for a breast drill.

2. In a drill, a frame, an operating shaft journaled in and extending beyond the frame and having its outer end squared for cooperation with a brace, bars slidable upon the frame, and a breast member carried on the outer ends of the bars and adapted to lie in engagement with the frame when the drill is operated with a brace, said bars being extended to dispose the breast mem ber beyond the outer end of the shaft to provide a breast drill.

3. In a drill, a frame, an operating shaft journaled in and extending beyond the frame and having its outer end squared for cooperation with a brace, bars slidable upon the frame, a breast member carried on the outer ends of the bars and adapted to lie in engagement with the frame when the drill is operated with a brace, said bars being extended to dispose the breast member beyond the outer end of the shaft to provide a breast drill, and spring pressed detents carriedon the frame, said bars having notches therein to receive the detents to lock the bars in extended position.

4t. A hand drill comprising a frame, a two piece operating shaft journaled in the frame having its upper section extending beyond the frame and squared for cooperation with a brace, gearing connecting the shaft pieces to one another and a breast member slidable upon the frame and adapted to be extended beyond the squared end of upper portion of said operating shaft to the operating shaft to permit the use 'of the permit the use of the frame for a breast frame for a breast drill. drill, and means to lock the breast member 5. A hand drill comprising a frame, a in extended position. 15 5 two piece operating shaft journaled in the Signed at Portland, Oregon, this 20th day frame having its upper portiop extending of August, 1917. beyond the frame and squared or coopera- I tion With a brace, gearing connecting the JOHN AUER' shaft pieces to one another, a breast member Witnesses: 1 slidable upon the frame and adapted to be Rosn MCAVOY.

extended beyond the squared end of the BERNICE SNYDER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

